Apple Aperture 3.5 - Manual (Page 268)

Chapter 7 Make image adjustments 268
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If you chose Skin Tone from the White Balance pop-up menu: Position the target area of the
Loupe over a skin tone in the image, and click.
The color tonality of the image is shifted either cooler or warmer, depending on the tonality of
the original image.
Important: Make sure that there is as little digital noise in the target area of the Loupe as
possible. Digital noise can skew the white balance calculation results, introducing a color cast
that wasn’t previously there. A simple way to avoid errant pixels is to increase the magnification
of the Loupe by pressing Shift–Command–Plus Sign (+).
Adjust the color temperature of an image manually
You can manually adjust an image’s white balance using the Warmth, Temp, and Tint
parameter controls.
You use the Warmth and Temp parameter controls to adjust the image’s color temperature. Color
temperature is a term used to describe the color of light when the image was shot. However,
it refers to the color value of the light rather than its heat value. Light’s color temperature is
measured in units called kelvin (K). Adjusting the color temperature of the image changes how
Aperture interprets the colors in the image in relation to the assigned temperature of light.
The purpose of adjusting the color temperature of an image is to make colors look as natural
as possible.
You can manually adjust the tint of an image using the Tint parameter controls. You use the Tint
parameter controls when you need to fine-tune the white balance adjustment by neutralizing
the remaining green or magenta tint.
Note: The Warmth and Temp parameter controls adjust the image’s color temperature in the
same way, except that Aperture doesn’t display the Warmth values in kelvin (K) units.
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